In January it said its reward tokens, which are worth up to four times more than points and can be redeemed at firms including Pizza Express, RAC, Cineworld and Uber, would be immediately cut to three times the value.

The change meant vouchers which would previously have been worth £10 to spend at one of the Tesco reward partners, would only now be worth £7.50.

After an outburst from angry customers it then backtracked on the change and postponed it to June 11, which gave customers a six-month window in which to use their vouchers at the higher rate.